The International Large Detector: Letter of Intent

TL;DR

The ILD is a highly granular, precision-focused detector concept designed for the ILC to enable detailed measurements in a clean lepton collider environment, complementing LHC physics.

Contribution

This paper presents the detailed design and integration plan of the ILD detector optimized for the ILC's precision physics program.

Findings

Design achieves high spatial resolution and particle reconstruction capabilities.

Mechanical and operational integration for push-pull detector scheme.

Calorimetry and tracking systems optimized for particle flow analysis.

Abstract

The International Large Detector (ILD) is a concept for a detector at the International Linear Collider, ILC. The ILC will collide electrons and positrons at energies of initially 500 GeV, upgradeable to 1 TeV. The ILC has an ambitious physics program, which will extend and complement that of the Large Hadron Collider (LHC). A hallmark of physics at the ILC is precision. The clean initial state and the comparatively benign environment of a lepton collider are ideally suited to high precision measurements. To take full advantage of the physics potential of ILC places great demands on the detector performance. The design of ILD is driven by these requirements. Excellent calorimetry and tracking are combined to obtain the best possible overall event reconstruction, including the capability to reconstruct individual particles within jets for particle ow calorimetry. This requires excellent spatial resolution for all detector systems. A highly granular calorimeter system is combined with a central tracker which stresses redundancy and efficiency. In addition, efficient reconstruction of secondary vertices and excellent momentum resolution for charged particles are essential for an ILC detector. The interaction region of the ILC is designed to host two detectors, which can be moved into the beam position with a push-pull scheme. The mechanical design of ILD and the overall integration of subdetectors takes these operational conditions into account.